Improvement in machines for calendering paper



T B. DE FOREST.

Improvelment in Machines for Calendeing Paper.'

Patented April 9, 1872.

PATENT OFFICE.

THOMAS B. DEronEsT, or BIRMINGHAM, CONNECTICUT.

IMPROVEMENT iN MACHlNES FOR CLENDERING PAPER.

Specification forming part of Letters Patent No. 125,548, dated April 9,1872.

` To all Iwhom it may concern.

Be it known that I, THOMAS B. DE FOREST, of Birmingham, in the county ofNew Haven and State of Connecticut, have invented a new Improvement inCalendering Paper; andI do hereby declare the following, when taken inconnection with the accompanying drawing and the letters of referencemarked thereon, to be a full, clear, and exact description of the same,and which said drawing constitutes part of this specification, andrepresents, in

Figure 1 a front View of a pair'of rolls embodying my improvement, andin Fig. 2 a partial section.

This invention relates to an improvement in calendering paper; theobject being to burnish or polish the surface of the paper as it comesfrom the drier and passes between the rolls; and it consists inimparting to one or more of the rolls a combined reciprocating androtary movement, whereby the roll is made to slide upon the paper at thesame time the paper passes directly through between the rolls.

A B are two common chilled or similar rolls arranged in suitable framesC, and compressed 1 together by sprin gs or screws in the usual manner;one or' the rolls being driven by power applied thereto causes the otherroll to revolve in like manner by means of pinions D D. Pass ing betweenrolls thus constructed the paper receives simply a pressure between therolls. To accomplish the object of -my invention and impart areciprocating movement to the rolls, I arrange a cam, E, by therevolution of which a slide, Vl?, is made to move forward and back in aline axially with the roll to be moved, and is connected with the roll,as seen in Fig. 2, so that the roll will be allowed to revolve freelynotwithstanding the connection with this slide. As the cani E revolvesit carA ries the slide F back and forth, and, beingin connection withthe roll, imparts the same movement to the roll as denoted in brokenlines, Fig. 2. The paper passing from the drier to the revolving rollsis received between them and hard pressed between the two. The surfaceto be polished being next the reciprocating roll, the reciprocatingmovement ofthe roll, at the same time of its revolving, causes the rollto slide back and forth on the surface of the paper. This slidingmovement should be at a greater velocity7 than the revolution of theroll, and consequently will burnish the surface, giving it a high lusterand extreme nicety ot' finish. 1f both surfaces are to be polished, thenalike reciprocating movement should be given to both rolls, but in suchcase one should be in reverse of the other, or two sets of rolls shouldbe used. One in each set, upon opposite surfaces of the paperfmay have alike reciprocating movement, the combined rotating andl reciprocatingmovement of one of the rolls acting upon one surface, with acorresponding bearing upon the other/surface, accomplishing the objectot' this invention.

I claim as my invention- A calender for paper, in which one or more ofthe rolls are constructed and provided with mechanism substantially suchas described, to impart to the said one or more rolls a longitudinal andreciprocating movement, combined with a revolving movement of the` saidroll or rolls.

' THOMAS B. DE FOREST.

Witnesses A. J. TIBnITs, J. H. SHUMWAY.

